[Sync] replace the flat layout with the unified stow tree

Supersedes the old flat .config/ layout (last published 2026-06-28) with the
private repo's structure: one shared base plus per-host overlays.

- packages: common/ gui/ lw/ fl/ wm/ plus install.sh and bin/ tooling
  (dotsync, reconcile-hyde.sh)
- new README covering the layout, deploy order and the HyDE dependency
- current HyDE waybar rig (layouts/, cava), pi agent extensions, claude/
  config, tmux, presenterm, aichat roles
- fish: kp (keepassxc-cli + fzf picker, db path from $KP_DB) and
  bind_M_n_history (alt+1..9 recalls the nth history entry)
- drops cruft that should never have been tracked: the duplicate top-level
  .pi/ copy, btop.log, zellij config.kdl.bak, fish_variables
- .pi/agent/auth.json is gitignored; auth.json.example ships instead

Host-specific work sessions and the personal backlog stay in the private
tree. Endpoint locators in the llamacpp/whisper guides are placeholders
($SERVER, <own-domain>) — the guides themselves stay, since they are the
useful part.

fl/.config/evremap/evremap.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Evremap Service
+After=multi-user.target
+
+[Service]
+WorkingDirectory=/
+# Config path must stay absolute: this is a system unit running as root, so ~ or $HOME would resolve to /root.
+ExecStart=bash -c "/usr/bin/evremap remap /home/anon/.config/evremap/evremap.toml -d 0"
+Restart=always
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target

fl/.config/evremap/evremap.toml

@@ -0,0 +1,60 @@
+# The name of the device to remap.
+# Run `sudo evremap list-devices` to see the devices available
+# on your system.
+device_name = "Logitech ERGO K860"
+
+# If you have multiple devices with the same name, you can optionally
+# specify the `phys` value that is printed by the `list-devices` subcommand
+# phys = "usb-0000:07:00.3-2.1.1/input0"
+
+# Configure CAPSLOCK as a Dual Role key.
+# Holding it produces LEFTCTRL, but tapping it
+# will produce ESC.
+# Both `tap` and `hold` can expand to multiple output keys.
+[[dual_role]]
+input = "KEY_CAPSLOCK"
+hold = ["KEY_LEFTCTRL"]
+tap = ["KEY_ESC"]
+
+# Turn RIGHT ALT into a vim-arrow layer.
+# We first neuter it: instead of ever emitting KEY_RIGHTALT (which apps treat
+# as "activate menu" on a bare tap), it becomes KEY_F13 -- a real keycode that
+# is unbound in every app, so tapping or holding right alt alone does nothing.
+# The chords below then turn F13 + h/j/k/l into the arrow keys.
+[[dual_role]]
+input = "KEY_RIGHTALT"
+hold = ["KEY_F13"]
+tap = ["KEY_F13"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_H"]
+output = ["KEY_LEFT"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_J"]
+output = ["KEY_DOWN"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_K"]
+output = ["KEY_UP"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_L"]
+output = ["KEY_RIGHT"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_U"]
+output = ["KEY_PAGEUP"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_D"]
+output = ["KEY_PAGEDOWN"]
+
+# Word-wise motion: emit Ctrl+Arrow so it jumps by word.
+[[remap]]
+input = ["KEY_F13", "KEY_B"]
+output = ["KEY_LEFTCTRL", "KEY_LEFT"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_W"]
+output = ["KEY_LEFTCTRL", "KEY_RIGHT"]